Low-noise transformer device

ABSTRACT

A low-noise transformer device is so arranged that the transformer main body is disposed inside of a noise-shielding chamber, and a cooler for cooling the insulation oil circulated throughout the transformer is cooled with a liquefied gas ejected onto a cooling pipe for removing out of the cooler heat corresponding principally to the heat of vaporization of the gas, which is discharged into the atmospheric without being recovered.

United States Patent inventor Hideo Katayama Kawasaki, Japan Appl. No. 95,793 Filed Dec. 7, 1970 Patented Dec. 21, 1971 Assignee Fuji Denki Seizo Kabushiki Kaisha Kanagawa-ken, Japan Priority Dec. 11, 1969 Japan 44/99688 LOW-NOISE TRANSFORMER DEVICE 2 Claims, 2 Drawing Figs.

US. Cl 336/55, 174/15 R, 336/100 int. Cl H01! 27/08 Field ofSearch 336/55,57,

5s, 59, 61,60, 100; 74/15 R, 16 R [56] References Cited UNITED STATES PATENTS 886,246 4/1908 Randall 336/57 X 1,334,041 3/1920 Lindstrom 336/57 2,711,882 6/1955 Narbutorskih 336/57 X Primary Examiner-Thomas .l. Kozma Attorney-Holman & Stern ABSTRACTrA low-noise transformer device is so arranged that the transformer main body is disposed inside of a noiseshielding chamber, and a cooler for cooling the insulation oil circulated throughout the transformer is cooled with a liquefied gas ejected onto a cooling pipe for removing out of the cooler heat corresponding principally to the heat of vaporization of the gas, which is discharged into the atmospheric without being recovered.

PATENTEU 05221 1521 3629.757

FIG. I

INVENTOR 242w /d12r y 7% V M ATTORNEYS LOW-NOISE TRANSFORMER DEVICE BACKGROUND OF THE INVENTION This invention relates generally to transformers and more particularly to a low-noise transformer device.

Recently, in accordance with rapid increase in the demand for electric power in cities and nearby areas, transformers of large capacities tend to be installed within such densely in habited areas. However, whenever the transformers are located near inhabited areas, reduction of noises from the transformer main body and also from the associated coolers is urgently required.

Heretofore, the noise of the transformer main body has been substantially reduced by surrounding the transformer within a noise-shielding wall structure. However, it has also been found that the reduction of the noises from the coolers associated with the transformer is more difficult than that of the transformer main body, and in some particular cases, the noises from the coolers have been louder than that of the transformer main body.

For instance, in the case of a self-cooled oil transformer, the noise from the transformer main body has been transmitted through the cooling oil to the associated coolers (or radiators) disposed outside of the noise-shielding chambers, so that another noise source has been thereby created. Likewise, in the case of an oil-circulated, blower-cooled transformer, the noise from the blowers has been considerably high, and in the case of a transformer having water-cooling towers, the noises from the blowers and also of the falling water have reached a still higher level.

SUMMARY OF THE INVENTION Therefore, a primary object of the present invention is to provide a transformer device the noise level of which is extremely low.

Another object of the invention is to provide a transformer device the noise level of which is substantially lowered through a simple and economical procedure.

Still another object of the invention is to provide a transformer device wherein a liquefied gas is employed as its ultimate cooling medium.

These and other objects of the present invention can be achieved by a novel transformer device according to the present invention wherein the transformer main body is enclosed in a noise-shielding chamber, a liquefied gas is ejected onto a cooling pipe of the cooler of the transformer oil for removing heat corresponding principally to the heat of vaporization of the gas, and the gas thus used is discharged into the atmosphere.

The nature, principle, and utility of the invention will be more clearly understood from the following detailed description of the invention when read in conjunction with the accompanying drawing.

BRIEF DESCRIPTION OF THE DRAWING In the drawing FIG. I is a schematic view of a transformer device according to the present invention; and

FIG. 2 is another schematic view showing another example of the transformer device according to the present invention.

DETAILED DESCRIPTION OF THE INVENTION Referring now to FIG. 1, there is indicated a main body 1 of a transformer device located in a noise-shielding chamber 2 in a building or surrounded by noise-shielding walls as is widely known in the art. A cooler 3 for cooling oil in the transformer main body I in this embodiment of the invention is provided outside of the noise-shielding chamber 2, and is connected to the transformer main body 1 through oil pipes 4 and an oilfeeding pump 41. On one hand, a liquefied gas stored in a tank is conducted through a pipe 6 and a pump 61 into the interior of the cooler 3 and ejected on to the outside surface of a cooling pipe 31 of the cooler 3. The liquefied gas contacting the cooler pipe 31 at a high temperature corresponding to that of the oil circulating through the transformer thereby evaporates, thus removing heat for vaporization out of the pipe 31 and reducing the temperature of the circulating oil.

It was found that the cooling device of the transformer having the above-described construction could reduce the noise level far lower than the conventional cooling systems such as that of the previously described air-cooled type or coolingtower type, and the cooling efficiency thereof was also excellent. The cooling medium thus evaporated is thereafter discharged directly into the atmosphere, whereby complication of the cooling device is avoided, and noise created in the cooling device can be substantially reduced.

For the liquefied gas employed as the cooling medium, a nonflammable gas such as nitrogen gas is used, whereby there is no possibility of fire hazard.

Further more, one set of the terminals of the transformer may be guided, as shown in the drawing, through bushings ll penetrating the wall 21 of the noise-shield chamber 2 to the outside of the chamber, and other set of terminals may be connected through elephant-type cable heads 12 to underground cables.

The noise-shield chamber 2 may be further provided with an air inlet port 22 and an exhaust port 23 through the walls 21 so that the temperature inside of the chamber is prevented from rising, these ports being provided in a manner which will not impair the noise-suppressing effect of the chamber 2.

Referring to FIG. 2, there is indicated another embodiment of the present invention wherein the cooling device 3 is provided inside of the noise-shielded chamber 20 together with the transformer main body I. In this arrangement, the evaporated gas which has cooled the cooling pipe 31 within the cooler 3 is discharged into the atmosphere through a tall stacklike exhaust tube 24 provided to communicate with the noise shielded chamber 20 for promoting the exhausting effect for the chamber. Further more, the storing tank 5 of the liquefied gas provided outside of the chamber 20 is connected with a pipe 6 through a pump 61 as in the case of the preceding example. The pipe 6 in this example may be branched to provide another pipeline 62 which is opened into the noiseshielded chamber 20 so that the liquefied gas may be partly discharged through the pipeline 62 and the temperature of the chamber 20 may be thereby controlled.

In either of the examples shown in FIGS. 1 and 2, the tank 5 for storing the liquefied gas may be placed at a higher level than that of the cooler 3, whereby the energy due to the difference in heights of the locations of the tank 5 and the cooler 3 can be effectively utilized and the pump 61 may be thereby omitted.

Iclaimf l. A low-noise transformer device comprising a noiseshielding chamber, a transformer main body located within said noise-shielding chamber, a liquefied gas storing tank provided outside of the noise-shielding chamber, and a cooler having a cooling pipe through which a cooling oil of the transformer is circulated, and onto the outside surface of which is ejected the liquefied gas from said storing tank, whereby an amount of heat corresponding principally to the heat of vaporization of the liquefied gas ejected onto the cooling pipe is removed out of the cooling oil of the transformer circulating inside of the pipe and the gas thus evaporated is discharged directly into the atmosphere outside of the chamber.

2. A low-noise transformer device comprising a noiseshielding chamber, a transformer main body located inside of the noise-shielding chamber, a liquefied gas storing tank provided outside of the noise-shielding chamber, a cooler provided inside of said noise-shielding chamber and having a cooling pipe through which a cooling oil of the transformer is circulated, and onto the outside surface of which is ejected the liquefied gas from said storing tank so that an amount of heat corresponding principally to the heat of vaporization of the liquefied gas ejected onto the pipe is removed out of the cooling oil of the transformer circulating inside of the pipe, and a stackiike exhaust tube provided in communication with said noise-shielding chamber for exhausting the liquefied gas thus evaporated on the cooler into the atmosphere outside of the chamber. 5 

1. A low-noise transformer device comprising a noise-shielding chamber, a transformer main body located within said noiseshielding chamber, a liquefied gas storing tank provided outside of the noise-shielding chamber, and a cooler having a cooling pipe through which a cooling oil of the transformer is circulated, and onto the outside surface of which is ejected the liquefied gas from said storing tank, whereby an amount of heat corresponding principally to the heat of vaporization of the liquefied gas ejected onto the cooling pipe is removed out of the cooling oil of the transformer circulating inside of the pipe And the gas thus evaporated is discharged directly into the atmosphere outside of the chamber.
 2. A low-noise transformer device comprising a noise-shielding chamber, a transformer main body located inside of the noise-shielding chamber, a liquefied gas storing tank provided outside of the noise-shielding chamber, a cooler provided inside of said noise-shielding chamber and having a cooling pipe through which a cooling oil of the transformer is circulated, and onto the outside surface of which is ejected the liquefied gas from said storing tank so that an amount of heat corresponding principally to the heat of vaporization of the liquefied gas ejected onto the pipe is removed out of the cooling oil of the transformer circulating inside of the pipe, and a stacklike exhaust tube provided in communication with said noise-shielding chamber for exhausting the liquefied gas thus evaporated on the cooler into the atmosphere outside of the chamber. 